The D4BS-15FS is a DIN-Rail mounted, spring-return safety switch manufactured by Omron. It is designed for applications that require low-cost, reliable safety interlocking, such as machine access, guard doors and e-stop systems. The switch features two Form A normally open and one Form C normally closed contacts, and a shunt release button. The durable plastic housing and simple wiring design make it easy to install and cost effective. It is also certified to UL and CSA safety standards.